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IF by shaking it in a Glass with the Salt of Urine, it be turned into an impalpa∣ble white Powder of its own accord, so that it doth not appear as Mercury, and of its own accord in an hot and dry place it coagulates again into a thin Mercury, it is enough; but yet better if being agitated in Fountain-water, it runs into small heads or particles, for if the grain be in the Body, it will not be thus con∣verted and separated into small minute parts.